Build ID 20191111170815
User Agent Mozilla/5.0 (Windows NT 6.1; rv:71.0) Gecko/20100101 Firefox/71.0

Steps to reproduce:

1. Launch Firefox
2. Go to any video, such as youtube: https://www.youtube.com/watch?v=IoinmjCmM-E and start the video
3. Toggle PIP
4. Pause the video
5. Unfocus the PIP window

Expected Result:
The PiP window should be unfocused without any visual issues

Actual Result:
Unfocusing the window will display a white border

The issue is reproducible all the time when the video is paused. When the video is playing the issue is intermittent while focusing/unfocusing the PiP window.

I'm not able to reproduce this with Nightly on Windows. Would you be able to post a short video demonstrating?

We've managed to reproduce this issue on Windows 7 x68 and Windows 10 x64 only on Beta build. The issue is not reproducible on Nightly on the same devices.

Here's the video: https://streamable.com/v7ntg

I suspect that some of the changes we made in Firefox 72 may have fixed this (my money is on bug 1567009).

Has this been seen at all recently in Firefox 72+?

Timea, can you please kindly check on this if you have cycles, and close if it's no longer reproducible?

Closing this as resolved:worksforme. This issue has also test coverage in our Nightly and Beta validations in each cycle and never failed since FX 84, tested across all desktop platforms.